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    <div class="post-body" itemprop="articleBody"><p>前面我们已经知道了怎么让平台设备和平台驱动进行匹配，那么匹配的目录肯定是驱动获取设备中的资源了，那怎么获取？设备能获取驱动的信息吗，能的话，又该怎么获取呢？若笔记中有错误或者不合适的地方，欢迎批评指正😃。</p>
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center" rowspan="5">PC端开发环境</td>        <td align="center" width=150px>Windows</td>        <td align="left">Windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu20.04.2的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 17 Pro</td>        <td align="left">17.6.0 build-24238078</td>      </tr>    <tr>        <td align="center">终端软件</td>        <td align="left">MobaXterm(Professional Edition v23.0 Build 5042 (license))</td>    </tr>    <tr>        <td align="center">Win32DiskImager</td>        <td align="left">Win32DiskImager v1.0</td>      </tr>    <tr>        <td align="center" rowspan="3">Linux开发板环境</td>        <td align="center">Linux开发板</td>        <td align="left">正点原子 i.MX6ULL Linux 阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，使用的uboot版本为U-Boot 2019.04</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.19.71(NXP官方提供)</td>      </tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="5">官方网站</td>        <td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td>        <td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/" target="_blank">https://www.nxp.com.cn/ </a></td>        <td align="left">NXP官方网站</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxpic.org.cn/" target="_blank">https://www.nxpic.org.cn/</a></td><td align="left">NXP 官方社区</td>    </tr>    <tr>        <td align="left"><a href="https://u-boot.readthedocs.io/en/latest/" target="_blank">https://u-boot.readthedocs.io/en/latest/</a></td><td align="left">u-boot官网</td>    </tr>    <tr>        <td align="left"><a href="https://www.kernel.org/" target="_blank">https://www.kernel.org/</a></td><td align="left">linux内核官网</td>    </tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="3">NXP</td>        <td align="left"><a href="https://github.com/nxp-imx" target="_blank">https://github.com/nxp-imx</a></td>        <td align="left">NXP imx开发资源GitHub组织，里边会有u-boot和linux内核的仓库</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/linux-imx/releases/tag/v4.19.71" target="_blank">nxp-imx/linux-imx/releases/tag/v4.19.71</a></td>        <td align="left">NXP linux内核仓库tags中的v4.19.71</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/uboot-imx/releases/tag/rel_imx_4.19.35_1.1.0" target="_blank">nxp-imx/uboot-imx/releases/tag/rel_imx_4.19.35_1.1.0</a></td>        <td align="left">NXP u-boot仓库tags中的rel_imx_4.19.35_1.1.0</td>    </tr>    <tr>        <td align="center" rowspan="2">I.MX6ULL</td>        <td align="left"><a href="https://www.nxp.com.cn/docs/en/data-sheet/IMX6ULLIEC.pdf" target="_blank">i.MX 6ULL Applications Processors for Industrial Products</a></td>        <td align="left">I.MX6ULL 芯片手册（datasheet，可以在线查看）</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/webapp/Download?colCode=IMX6ULLRM&lang_cd=zh" target="_blank">i.MX 6ULL Applications ProcessorReference Manual</a></td>        <td align="left">I.MX6ULL 参考手册（下载后才能查看，需要登录NXP官网）</td>    </tr>    <tr>        <td align="center" rowspan="3">Source Code</td>        <td align="left"><a href="https://elixir.bootlin.com/linux/latest/source" target="_blank">https://elixir.bootlin.com/linux/latest/source</a></td>        <td align="left">linux kernel源码</td>    </tr>    <tr>        <td align="left"><a href="https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/?h=v4.19.71&id=e7d2672c66e4d3675570369bf20856296da312c4" target="_blank">kernel/git/stable/linux.git - Linux kernel stable tree</a></td>        <td align="left">linux kernel源码(官网,tag 4.19.71)</td>    </tr>    <tr>        <td align="left"><a href="https://elixir.bootlin.com/u-boot/latest/source" target="_blank">https://elixir.bootlin.com/u-boot/latest/source</a></td>        <td align="left">uboot源码</td>    </tr></table>
              </div>
            </details>

<h1 id="一、设备获取驱动的资源"><a href="#一、设备获取驱动的资源" class="headerlink" title="一、设备获取驱动的资源"></a><font size=3>一、设备获取驱动的资源</font></h1><p>前面在学习平台设备和平台驱动的时候，我们有看到这个 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L546">struct platform_device_id</a> 结构体，它在  <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L23">struct platform_device</a> 和 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L180">struct platform_driver</a> 都有，设备获取驱动资源可以通过这个来进行，接下来就来了解一下吧。</p>
<h2 id="1-struct-platform-device-id"><a href="#1-struct-platform-device-id" class="headerlink" title="1. struct platform_device_id"></a><font size=3>1. <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L546">struct platform_device_id</a></font></h2><p>先来回顾一下这个结构体，<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L546">struct platform_device_id</a> 结构体定义如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_device_id</span> &#123;</span></span><br><span class="line">	<span class="type">char</span> name[PLATFORM_NAME_SIZE];</span><br><span class="line">	<span class="type">kernel_ulong_t</span> driver_data;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>

<p>在 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L546">struct platform_device_id</a> 这个结构体中，有两个成员，第一个是数组用于指定驱动的名称，总线进行匹配时，会依据该结构体的name成员与 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L23">struct platform_device</a> 中的成员name进行比较匹配， 另一个成员变量driver_data，则是用于来保存设备的配置。我们知道在同系列的设备中，往往只是某些寄存器的配置不一样，为了减少代码的冗余， 尽量做到一个驱动可以匹配多个设备的目的。</p>
<h2 id="2-平台设备怎么得到这个结构体数据？"><a href="#2-平台设备怎么得到这个结构体数据？" class="headerlink" title="2. 平台设备怎么得到这个结构体数据？"></a><font size=3>2. 平台设备怎么得到这个结构体数据？</font></h2><p>前面学习id匹配的时候，完成id匹配的是这个 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L936">platform_match_id()</a> 函数：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">const</span> <span class="keyword">struct</span> platform_device_id *<span class="title function_">platform_match_id</span><span class="params">(</span></span><br><span class="line"><span class="params">			<span class="type">const</span> <span class="keyword">struct</span> platform_device_id *id,</span></span><br><span class="line"><span class="params">			<span class="keyword">struct</span> platform_device *pdev)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="keyword">while</span> (id-&gt;name[<span class="number">0</span>]) &#123;</span><br><span class="line">		<span class="keyword">if</span> (<span class="built_in">strcmp</span>(pdev-&gt;name, id-&gt;name) == <span class="number">0</span>) &#123;</span><br><span class="line">			pdev-&gt;id_entry = id;</span><br><span class="line">			<span class="keyword">return</span> id;</span><br><span class="line">		&#125;</span><br><span class="line">		id++;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">return</span> <span class="literal">NULL</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>我们可以看一下传进来的都是什么：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-05-linux%E5%B9%B3%E5%8F%B0%E6%80%BB%E7%BA%BF%E6%A8%A1%E5%9E%8B-04-%E9%A9%B1%E5%8A%A8%E5%92%8C%E8%AE%BE%E5%A4%87%E8%B5%84%E6%BA%90%E7%9A%84%E8%8E%B7%E5%8F%96/img/image-20250120113558619.png" alt="image-20250120113558619"  />

<p>可以看到，传进来的指针 id 指向的是 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L187">platform_driver.id_table</a>，而指针 pdev则是 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L23">platform_device</a> 。在函数内部，遍历 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L187">platform_driver.id_table</a> 中的成员，当 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L187">platform_driver.id_table[i].</a><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L547">name</a>和 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L24">platform_device.name</a> 匹配的相等的时候，就将<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L31">platform_device.id_entry</a> 这个指针指向 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L187">platform_driver.id_table[i]</a> 的地址：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-05-linux%E5%B9%B3%E5%8F%B0%E6%80%BB%E7%BA%BF%E6%A8%A1%E5%9E%8B-04-%E9%A9%B1%E5%8A%A8%E5%92%8C%E8%AE%BE%E5%A4%87%E8%B5%84%E6%BA%90%E7%9A%84%E8%8E%B7%E5%8F%96/img/image-20250120135653502.png" alt="image-20250120135653502"  />

<p>当匹配成功的时候，我们就可以以访问 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L31">platform_device.id_entry</a> 来获取驱动中的数据了，即访问平台设备的<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L31">platform_device.id_entry.</a><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L548">driver_data</a> 成员就是访问平台驱动的 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L187">platform_driver.id_table[i].</a><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/mod_devicetable.h#L548">driver_data</a> 成员。</p>
<h2 id="3-应用场景"><a href="#3-应用场景" class="headerlink" title="3. 应用场景"></a><font size=3>3. 应用场景</font></h2><p>可以以以imx的串口为例，具体看下这个结构体的作用：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">imx_uart_data</span> <span class="title">imx_uart_devdata</span>[] =</span> &#123;</span><br><span class="line">    [IMX1_UART] = &#123;</span><br><span class="line">        .uts_reg = IMX1_UTS,</span><br><span class="line">        .devtype = IMX1_UART,</span><br><span class="line">    &#125;,</span><br><span class="line">    [IMX21_UART] = &#123;</span><br><span class="line">        .uts_reg = IMX21_UTS,</span><br><span class="line">        .devtype = IMX21_UART,</span><br><span class="line">    &#125;,</span><br><span class="line">    [IMX6Q_UART] = &#123;</span><br><span class="line">        .uts_reg = IMX21_UTS,</span><br><span class="line">        .devtype = IMX6Q_UART,</span><br><span class="line">    &#125;,</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">platform_device_id</span> <span class="title">imx_uart_devtype</span>[] =</span> &#123;</span><br><span class="line">    &#123;</span><br><span class="line">        .name = <span class="string">&quot;imx1-uart&quot;</span>,</span><br><span class="line">        .driver_data = (<span class="type">kernel_ulong_t</span>) &amp;imx_uart_devdata[IMX1_UART],</span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        .name = <span class="string">&quot;imx21-uart&quot;</span>,</span><br><span class="line">        .driver_data = (<span class="type">kernel_ulong_t</span>) &amp;imx_uart_devdata[IMX21_UART],</span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        .name = <span class="string">&quot;imx6q-uart&quot;</span>,</span><br><span class="line">        .driver_data = (<span class="type">kernel_ulong_t</span>) &amp;imx_uart_devdata[IMX6Q_UART],</span><br><span class="line"></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="comment">/* sentinel */</span></span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>

<p>在上面的代码中，支持三种设备的串口，支持imx1、imx21、imx6q三种不同系列芯片，他们之间区别在于串口的test寄存器地址不同。 当总线成功配对平台驱动以及平台设备时，会将对应的id_table条目赋值给平台设备的id_entry成员，而平台驱动的probe函数是以平台设备为参数， 这样的话，就可以拿到当前设备串口的test寄存器地址了。</p>
<h2 id="4-设备获取驱动资源demo"><a href="#4-设备获取驱动资源demo" class="headerlink" title="4. 设备获取驱动资源demo"></a><font size=3>4. 设备获取驱动资源demo</font></h2><h3 id="4-1-demo源码"><a href="#4-1-demo源码" class="headerlink" title="4.1 demo源码"></a><font size=3>4.1 demo源码</font></h3><p><a target="_blank" rel="noopener" href="https://gitee.com/sumumm/imx6ull-driver-demo/tree/master/06_platform_bus/05_id_match_get_drv_info">06_platform_bus&#x2F;05_id_match_get_drv_info · 苏木&#x2F;imx6ull-driver-demo - 码云 - 开源中国</a></p>
<h3 id="4-2-开发板验证"><a href="#4-2-开发板验证" class="headerlink" title="4.2 开发板验证"></a><font size=3>4.2 开发板验证</font></h3><p>将编译完的sdriver_demo.ko、sdevice_demo.ko拷贝到开发板，然后执行以下命令加载：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">insmod sdriver_demo.ko</span><br><span class="line">insmod sdevice_demo.ko</span><br></pre></td></tr></table></figure>

<p>然后就会看到以下打印信息：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-05-linux%E5%B9%B3%E5%8F%B0%E6%80%BB%E7%BA%BF%E6%A8%A1%E5%9E%8B-04-%E9%A9%B1%E5%8A%A8%E5%92%8C%E8%AE%BE%E5%A4%87%E8%B5%84%E6%BA%90%E7%9A%84%E8%8E%B7%E5%8F%96/img/image-20250120141723359.png" alt="image-20250120141723359"  />

<p>可以看到驱动中的xxx_probe()函数执行，然后会有提示驱动和设备匹配成功。为了方便查看平台设备获取驱动中资源的情况，我们可以看一下 &#x2F;sys&#x2F;bus&#x2F;platform&#x2F;devices&#x2F;sdev 中的属性文件的值：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/bus/platform/devices/sdev/sdev_attr_reg</span><br><span class="line">cat /sys/bus/platform/devices/sdev/sdev_attr_type</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-05-linux%E5%B9%B3%E5%8F%B0%E6%80%BB%E7%BA%BF%E6%A8%A1%E5%9E%8B-04-%E9%A9%B1%E5%8A%A8%E5%92%8C%E8%AE%BE%E5%A4%87%E8%B5%84%E6%BA%90%E7%9A%84%E8%8E%B7%E5%8F%96/img/image-20250120141916436.png" alt="image-20250120141916436"  />

<p>其实可以在匹配之前看一下的:</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-05-linux%E5%B9%B3%E5%8F%B0%E6%80%BB%E7%BA%BF%E6%A8%A1%E5%9E%8B-04-%E9%A9%B1%E5%8A%A8%E5%92%8C%E8%AE%BE%E5%A4%87%E8%B5%84%E6%BA%90%E7%9A%84%E8%8E%B7%E5%8F%96/img/image-20250120143729078.png" alt="image-20250120143729078"  />

<h1 id="二、驱动获取设备资源"><a href="#二、驱动获取设备资源" class="headerlink" title="二、驱动获取设备资源"></a><font size=3>二、驱动获取设备资源</font></h1><h2 id="1-怎么获取设备资源？"><a href="#1-怎么获取设备资源？" class="headerlink" title="1. 怎么获取设备资源？"></a><font size=3>1. 怎么获取设备资源？</font></h2><p>这个就比较简单了，因为传到驱动中的是平台设备的哪个全局变量，我们可以直接访问平台设备的资源数组。</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">sdrv_probe</span><span class="params">(<span class="keyword">struct</span> platform_device *pdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    PRT(<span class="string">&quot;probing platform device &amp; driver!pdev-&gt;name=%s\n&quot;</span>, pdev-&gt;name);</span><br><span class="line">    <span class="comment">// 添加设备特定的操作</span></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>例如上面的sdrv_probe()函数，我们可以通过 pdev 直接访问的，也就是说 pdev直接指向这个对象：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 定义一个平台设备全局变量</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">platform_device</span> <span class="title">g_sdev_platform</span> =</span> &#123;</span><br><span class="line">    .name = PLATFORM_DEV_NAME,                     <span class="comment">// 设备名称</span></span><br><span class="line">    .id = <span class="number">-1</span>,                                      <span class="comment">// 设备ID</span></span><br><span class="line">    .num_resources = ARRAY_SIZE(g_sdev_resources), <span class="comment">// 资源数量</span></span><br><span class="line">    .resource = g_sdev_resources,                  <span class="comment">// 资源数组</span></span><br><span class="line">    .dev.release = sdev_release,                   <span class="comment">// 释放资源的回调函数</span></span><br><span class="line">    .id_entry = &amp;g_sdev_id,                        <span class="comment">// 用于ID匹配时获取驱动返回的匹配信息</span></span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>

<p>通过 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L29">platform_device.resource</a> 就可以获取资源数组中所有数据，通过 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/platform_device.h#L28">platform_device.num_resources</a>可以获取到设备一共有多少个资源。</p>
<h2 id="2-获取资源的函数"><a href="#2-获取资源的函数" class="headerlink" title="2. 获取资源的函数"></a><font size=3>2. 获取资源的函数</font></h2><p>linux内核提供了几个函数来帮我们获取资源。其实前面都了解设备信息的时候都了解过了，就那几个函数。</p>
<h3 id="2-1-platform-get-resource"><a href="#2-1-platform-get-resource" class="headerlink" title="2.1 platform_get_resource()"></a><font size=3>2.1 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L60">platform_get_resource()</a></font></h3><p><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L60">platform_get_resource()</a> 定义如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">struct</span> resource *<span class="title function_">platform_get_resource</span><span class="params">(<span class="keyword">struct</span> platform_device *dev,</span></span><br><span class="line"><span class="params">				       <span class="type">unsigned</span> <span class="type">int</span> type, <span class="type">unsigned</span> <span class="type">int</span> num)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="type">int</span> i;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; dev-&gt;num_resources; i++) &#123;</span><br><span class="line">		<span class="class"><span class="keyword">struct</span> <span class="title">resource</span> *<span class="title">r</span> =</span> &amp;dev-&gt;resource[i];</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (type == resource_type(r) &amp;&amp; num-- == <span class="number">0</span>)</span><br><span class="line">			<span class="keyword">return</span> r;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">return</span> <span class="literal">NULL</span>;</span><br><span class="line">&#125;</span><br><span class="line">EXPORT_SYMBOL_GPL(platform_get_resource);</span><br></pre></td></tr></table></figure>

<p>该函数返回该 dev 中某类型(type)资源中的第几个(num，其中num的值从0开始)  。</p>
<h3 id="2-2-platform-get-irq"><a href="#2-2-platform-get-irq" class="headerlink" title="2.2 platform_get_irq()"></a><font size=3>2.2 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L82">platform_get_irq()</a></font></h3><p><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L82">platform_get_irq()</a> 函数定义如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * platform_get_irq - get an IRQ for a device</span></span><br><span class="line"><span class="comment"> * @dev: platform device</span></span><br><span class="line"><span class="comment"> * @num: IRQ number index</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">platform_get_irq</span><span class="params">(<span class="keyword">struct</span> platform_device *dev, <span class="type">unsigned</span> <span class="type">int</span> num)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="comment">//......</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>返回该 dev 所用的第几个(num)中断。</p>
<h3 id="2-3-platform-get-resource-byname"><a href="#2-3-platform-get-resource-byname" class="headerlink" title="2.3 platform_get_resource_byname()"></a><font size=3>2.3 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L155">platform_get_resource_byname()</a></font></h3><p><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L155">platform_get_resource_byname()</a> 定义如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * platform_get_resource_byname - get a resource for a device by name</span></span><br><span class="line"><span class="comment"> * @dev: platform device</span></span><br><span class="line"><span class="comment"> * @type: resource type</span></span><br><span class="line"><span class="comment"> * @name: resource name</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">struct</span> resource *<span class="title function_">platform_get_resource_byname</span><span class="params">(<span class="keyword">struct</span> platform_device *dev,</span></span><br><span class="line"><span class="params">					      <span class="type">unsigned</span> <span class="type">int</span> type,</span></span><br><span class="line"><span class="params">					      <span class="type">const</span> <span class="type">char</span> *name)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="type">int</span> i;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; dev-&gt;num_resources; i++) &#123;</span><br><span class="line">		<span class="class"><span class="keyword">struct</span> <span class="title">resource</span> *<span class="title">r</span> =</span> &amp;dev-&gt;resource[i];</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (unlikely(!r-&gt;name))</span><br><span class="line">			<span class="keyword">continue</span>;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (type == resource_type(r) &amp;&amp; !<span class="built_in">strcmp</span>(r-&gt;name, name))</span><br><span class="line">			<span class="keyword">return</span> r;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">return</span> <span class="literal">NULL</span>;</span><br><span class="line">&#125;</span><br><span class="line">EXPORT_SYMBOL_GPL(platform_get_resource_byname);</span><br></pre></td></tr></table></figure>

<p>通过名字(name)返回该 dev 的某类型(type)资源。</p>
<h3 id="2-4-platform-get-irq-byname"><a href="#2-4-platform-get-irq-byname" class="headerlink" title="2.4 platform_get_irq_byname()"></a><font size=3>2.4 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/drivers/base/platform.c#L180">platform_get_irq_byname()</a></font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * platform_get_irq_byname - get an IRQ for a device by name</span></span><br><span class="line"><span class="comment"> * @dev: platform device</span></span><br><span class="line"><span class="comment"> * @name: IRQ name</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">platform_get_irq_byname</span><span class="params">(<span class="keyword">struct</span> platform_device *dev, <span class="type">const</span> <span class="type">char</span> *name)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">resource</span> *<span class="title">r</span>;</span></span><br><span class="line"></span><br><span class="line">	<span class="keyword">if</span> (IS_ENABLED(CONFIG_OF_IRQ) &amp;&amp; dev-&gt;dev.of_node) &#123;</span><br><span class="line">		<span class="type">int</span> ret;</span><br><span class="line"></span><br><span class="line">		ret = of_irq_get_byname(dev-&gt;dev.of_node, name);</span><br><span class="line">		<span class="keyword">if</span> (ret &gt; <span class="number">0</span> || ret == -EPROBE_DEFER)</span><br><span class="line">			<span class="keyword">return</span> ret;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);</span><br><span class="line">	<span class="keyword">return</span> r ? r-&gt;start : -ENXIO;</span><br><span class="line">&#125;</span><br><span class="line">EXPORT_SYMBOL_GPL(platform_get_irq_byname);</span><br></pre></td></tr></table></figure>

<p>通过名字(name)返回该 dev 的中断号。</p>
<h3 id="2-5-dev-get-platdata"><a href="#2-5-dev-get-platdata" class="headerlink" title="2.5 dev_get_platdata()"></a><font size=3>2.5 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/device.h#L1252">dev_get_platdata()</a></font></h3><p>对于存放在device结构体中成员platform_data的软件信息，我们可以使用<a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/device.h#L1252">dev_get_platdata()</a> 函数来获取：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="keyword">inline</span> <span class="type">void</span> *<span class="title function_">dev_get_platdata</span><span class="params">(<span class="type">const</span> <span class="keyword">struct</span> device *dev)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="keyword">return</span> dev-&gt;platform_data;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="2-6-resource-size"><a href="#2-6-resource-size" class="headerlink" title="2.6 resource_size()"></a><font size=3>2.6 <a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/ioport.h#L196">resource_size()</a></font></h3><p><a target="_blank" rel="noopener" href="https://elixir.bootlin.com/linux/v4.19.71/source/include/linux/ioport.h#L196">resource_size()</a>函数用于获取资源的大小，定义如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="keyword">inline</span> <span class="type">resource_size_t</span> <span class="title function_">resource_size</span><span class="params">(<span class="type">const</span> <span class="keyword">struct</span> resource *res)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="keyword">return</span> res-&gt;end - res-&gt;start + <span class="number">1</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="3-驱动获取设备资源demo"><a href="#3-驱动获取设备资源demo" class="headerlink" title="3. 驱动获取设备资源demo"></a><font size=3>3. 驱动获取设备资源demo</font></h2><h3 id="3-1-demo源码"><a href="#3-1-demo源码" class="headerlink" title="3.1 demo源码"></a><font size=3>3.1 demo源码</font></h3><p><a target="_blank" rel="noopener" href="https://gitee.com/sumumm/imx6ull-driver-demo/tree/master/06_platform_bus/06_drv_get_dev_resource">06_platform_bus&#x2F;06_drv_get_dev_resource · 苏木&#x2F;imx6ull-driver-demo - 码云 - 开源中国</a></p>
<h3 id="3-2-开发板验证"><a href="#3-2-开发板验证" class="headerlink" title="3.2 开发板验证"></a><font size=3>3.2 开发板验证</font></h3><p>将编译完的sdriver_demo.ko、sdevice_demo.ko拷贝到开发板，然后执行以下命令加载：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">insmod sdriver_demo.ko</span><br><span class="line">insmod sdevice_demo.ko</span><br></pre></td></tr></table></figure>

<p>然后就会看到以下打印信息：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV06-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV06-05-linux%E5%B9%B3%E5%8F%B0%E6%80%BB%E7%BA%BF%E6%A8%A1%E5%9E%8B-04-%E9%A9%B1%E5%8A%A8%E5%92%8C%E8%AE%BE%E5%A4%87%E8%B5%84%E6%BA%90%E7%9A%84%E8%8E%B7%E5%8F%96/img/image-20250120153400862.png" alt="image-20250120153400862"  />

<p>可以看到驱动中的xxx_probe()函数执行，然后会有提示驱动和设备匹配成功。然后便会在xxx_probe()函数中分两种方式打印出从平台设备获取的资源。</p>

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